Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49327a798eddf54…

MALICIOUS

PDF

49.5 KB Created: 2020-07-31 12:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3dc157107ea8e1f5c311372cae71564e SHA-1: b8d01ca2c1f1bd0fbf526b67fa1e7d462f8761e7 SHA-256: a49327a798eddf54d99805f36eb485ab62a43121b338ac471803c1fe05732f8a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of the primary links redirects to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to "string theory book pdf", indicating a potential phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=string+theory+book+pdf In PDF document text
    • http://files.kyokanconnect.com/uploads/1/3/2/7/132710627/d46f7ae3.pdfIn PDF document text
    • http://files.guide2tech4teachers.com/uploads/1/3/0/8/130874075/6341713.pdfIn PDF document text
    • http://files.mootingsyndicate.org/uploads/1/3/1/4/131483253/lewotidedimitufemini.pdfIn PDF document text
    • http://files.ajukmapparel4.com/uploads/1/3/0/7/130740490/4408239.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8393/2582/files/muwexixamoxatudel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0255/9655/files/xuzugepenolixazew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7073/2950/files/8799586665.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7081/5397/files/64114238554.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/falololirenajali.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/jafapomesigusajuxef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5896/1320/files/11609306627.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5729/1169/files/kulojukodawog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3794/0133/files/fisogikavowit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7400/0798/files/96698246938.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0365/7887/files/xidijilagemur.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8534 5080 bytes
SHA-256: d0f95dd8f6eae4d8113ed67a8c432f335a6e3fd61a59e23e73b2b6f4275b1729
font_01_sfnt_off0000966b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x966B 10192 bytes
SHA-256: ee786dc8200ed99eea11e53e69b50c6953aef0d5652f2df36db7aa2ec3ae9811

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